Study on the fine・cale mixing ・ chemical reaction process of matter in the liquid turbulent flows and the stochastic simulation method

研究的进展和结果是在以下情况下总结的。目标（A）对多个物种聚集通量的高分辨率测量系统的开发，以及对混合和多个物种的反应领域的测量，我们根据光学纤维的直径为10微米的多个物种开发了一个相似的测量系统的聚集通量的3个物种。什么是有用的液体相位湍流混合场？如果要改进测量的准确性，则通过使用参考信号（在集中0例中）获得实际集中信号的新数据处理技术，并建议使用测量信号。用于两个尺寸的涡轮反应式喷气式飞机的实验装置也是制造的，而没有集中场的反应是通过新的集中测量系统来衡量的。这是在基本统计数据中找到的，例如：mean concentration and the r.m.s.价值，等等，显示 ... More 与以前的衡量系统中出现的相同的配置文件。因此，它包含在一个新系统中，以便在湍流扩散场进行集中测量。此外，在两个尺寸喷气式飞机上的二级化学反应场的测量是通过使用前测量系统进行的，而且对化学反应和波动之间的关系的理解是促进的。对象（B）通过固体差异方程和随机-傅里叶模式方法对不同和反应场的数值模拟。第二个模拟-在轴向涡轮喷气机中的顺序化学反应场是由拉格朗日概率密度函数方法（PDF方法）制造的。实际上，根据速度的第二顺序，将实验数据用于实验数据，PDF方法只应用于集中字段（我们称之为半实证PDF方法）。在这个模拟中，IEM模型被用作分子混合模型。事实上，这证实了由于这个半现实PDF方法而导致的集中流动字段与所有物种的化学反应都是成功预测的。在另一边，两个尺寸的空气油周围的湍流场被随机傅里叶模式和快速失真理论的组合模型模拟。它已经找到了流量的统计数据，并且在流量规格中可以被这个组合的模型预测得很好。目前，随机傅立叶模式方法和分子混合模型的混合模型已经得到了发展。Less（低）

The progress and results of the research are summarized in the following.Obiect(A) Development of high resolution measuring system of concentration fluctuations for multiple species, and the measurements of mixing ・ reactive field of multiple 'species by this systemWe developed the simultaneous measuring system of concentration fluctuations for 3 species by the optical fiber with the diameter of 10 u m, which is useful for the liquid-phase turbulent mixing field. In order to improve the accuracy of measurement, the new data processing technique to obtain the actual concentration signal by using the reference signal (in case of concentration 0) and measuring signal was suggested. The experimental apparatus for the two-dimensional turbulent reactive jet was also manufactured, and the concentration field without the reaction was measured by the new concentration measuring system. It is found that the fundamental statistics, e.g., the mean concentration and the r.m.s. value, etc. show the … More same profiles as those obtained by the former measuring system. So, it was concluded that the new system is useful for the concentration measurement in the turbulent diffusion field. Further, the measurements for the second-order chemical reaction field in the two-dimensional jet have been performed by using the former measuring system, and the understanding for the relationship between the chemical reaction and turbulence was promoted.Object(B) Numerical simulations of the diffusive ・ reactive fields by the stochastic differential equation and random-Fourier modes method.The simulation of the second-order chemical reaction field in the axisymmetric turbulent jet has been made by the Lagrangian probability density function method (PDF method). Practically, the experimental data for the moments up to the second order of the velocity PDF are specified, and the PDF method was applied to only the concentration field (we call this technique the semi-empirical PDF method). In this simulation, the IEM model was used as the molecular mixing model. Consequently, it is confirmed that the concentration fluctuation fields for all the species relating to the chemical reaction were predicted successfully by this semi-empirical PDF method. On the other hand, the turbulent field around the two-dimensional aerofoil was simulated by the combined model of the random Fourier modes and the rapid distortion theory. It is found that the fluctuation velocity statistics, in particular the velocity spectra can be predicted well by this combined model. At present, the hybrid model of the random Fourier modes method and the molecular mixing model is being developed. Less